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This bug is to determine is there is some way of collecting JSVM code coverage on tests that purposely fail in the jittest test suite. Currently, there are many places in JIT/IonMonkey that runtime errors come from so there does not seem to be a common place to deal with them if we collect code coverage. We should investigate if this behaviour is needed and if it can be done.
The tests that are failing for this reason are:
1. xdr/bug1186973.js
2. basic/werror.js